Saw-controlling mechanism



-G. L. ROGERS AND R. E. GRAY.

SAW CONTROLLING MECHANISM.

APPLICATION FILED FEB. 25, 192!- ATTORNEY.

rammed Nov. 29, 1921.

srarss ice- GUY L. noenasann ROBERT E. GRAY, or SNOQUALAIVIIE FALLS, wasnmeron.

SAW-CONTROLLING MECHANISM.

reaa'aes.

To all whom/it may concern:

Be it known that we, GUY L. Rooms and Ronnnr E. GRAY, are citizens of the United States, and residing at Snoqualamie Falls, in the county of King and State of Washington, have invented certain new and useful Improvements in Saw-Controlling Mechanism, of which the following is a specification. 1 y f This invention relates to improvements in sawing apparatus of that type wherein the saw is normally held withdrawn from the" operative plane'in order to protect the operator, the saw being moved into. and maintained in the operative plane when required for sawing purposes. V

The present invention is directed particularly to a means for initially moving the saw into an operative plane and maintaim ing it in such plane at the will of the operator, the means being electrically controlled chain and are adapted to engage the material as 6 and move the same longitudinally of the table to be operated upon by the saw.

A saw frame 7 is pivotally mounted on a hanger 8 depending from the table 1, the saw frame having a shaft 10 at one end on which is secured a saw 11. A pulley 12 is secured upon the shaft 10 and driven by a.

belt 13 from a suitably operated pulley 14 mounted upon the shaft 15.

The saw frame by reason of its pivotal mounting may be operated to movethe saw through an opening in the table 1, and there fore into a position to operate upon the material fed to it, or such frame may be operated to move the saw to a position below the Y table, to thereby protect the operator against possible injury.

The present invention is concerned with the means whereby theframe 7 may be operated for the purposes described. In carrying out the invention, the end of the frame Specification of Letters Patent. 7 Patented NOV. 29, 11.921; Application filed. February 25, 1921. Serial No. 447,791. I

7 remote from thesaw 11 is provided with a depending rod '16, provided near its lower end with a cross head 17 guided in rectangula r guides 18 carried by rods 19 secured to and rising froman appropriate'support 20.

The rod '16 below thecross head is formed to provide a core 21 of a solenoid 22, and below the core, the rod terminates in a spherical head 23," adapted when the rod is at its lowest limited movement, to seat in a socket 24 secured to the support 20. A switch elei ment 25 is pivotally supported on solenoid case and carries a contact 26 adapted to engage a contact 27 secured on the solenoid case in one position; of the switch element.

A rod 28;is arranged to operate the switch element in one direction, a spring 29 serving to normally. operate the switcln element in circuit-closing direction. The upper end of v the rod 28 has a lateral projection 30 arranged in the path of a block 31' secured on the rod 16. I

The circuits included in the improved arrangement, are served from a battery or other source of energy 32 through conductors 33 and 34, the usual fuse sections 35 being included. One of the conductors as 34 leads directly to a contact 36 on the solenoid case from which a lead extends to the contact 27. The other conductor 33 leads through a manually operable switch 37 to the solenoid winding and from the solenoid winding to a contact 38 on the case from which a lead 39 is connected to the switch element 25. A shunt circuit 40 is connected around the switch element, that is, from the I closing the switch 37, the current will flow 7 through the solenoid and aroundthe' shunt, as' a switch element is 1n circultmg posltion. The core 21 is thus drawn down into the solenoid, and the saw correspondingly moved upward into operative position. Movement continues until the block 31, which may be adjustable, if desired, engages the end 30 of the arm 28 and opens the switch element. The current is then compelled to travel the shunt path introducing that resistance into the circuit, which controlsthe current to a value suitable to the solenoid winding. The saw'is thus held in operative position and at the adjusted a shunt circuit around the switch including height, controlled by the adjustment of the block 31, until the switch 37 is opened, whereupon the weight of the saw, and con-. nected parts, draws upon the rod 16 to restore the normal circuit through the switch element 25, so that upon again closing the switch 37, the operation will be repeated.

What we claim is 1. A sawing apparatus including a saw carrying frame mounted for pivotal movement, a solenoid for operating the frame in one direction, and means for automatically reducing the current, to the solenoid to hold the frame in operated position.

2. A sawing apparatus including a saw carrying frame mounted for pivotal movement, a rod for actuating the frame, a sole noid, said rod forming a core 'for said solenoid, a circuit for energizing the solenoid, a shunt circuit including-a resistance, a switch for controlling the shunt circuit, and means operated inthe movement of the rod for actuating the switch.

3. A sawing apparatus including a movable sawframe, a rod for operating the same, a solenoid, the rod forming a core 7 for the solenoid, a circuit for ener izing the solenoid, a switch included in said circuit,

a resistance, arod for operating theswitch, and means for actuating the rod in the operative movement of the saw frame.

7 4. A sawing apparatus including a movable saw frame, a rod for operating the same,a solenoid, the rod forming a core for v the solenoid, a circuit forenergizing the solenoid, a" switch included in said circuit, a shunt circuit around the switch including a resistance, a member for operating the switch, and a blockon said rod for cooperating with the member in the movement of the rod. 7

5. A sawing apparatus including a movable saw frame, a rod for operating the same, a solenoid, the rod forming a core for the solenoid, a circuit for energizing the solenoid, a switoh included in said circuit, a shunt circuit around the switch including a resistance, a member for operating the switch, and a block adjustable on said rod for cooperating with the member in the movement of the rod.

In testimony whereof we aflix our signatures.

our L. ROGERS.

ROBERT E; GRAY. 

